Select Columns contains errors

Hello Anonymous 

This solution should give you a perfect overview in witch Row and Column the error occured, with all details of the reason.

let
	Source = #table 
	(
		{"TaskList SignOff Date and Time","TaskList SignOff Date and Time2"},
		{ {"43849,4374997106","43849,4374997106"}, {"43849,4583329861","43849,4583329861"}, {"43849,4791662616","43849,4791662616"}, {"43849,499999537","43849,499999537"}, {"43849,5208328125","43849,5208328125"}, {"43849,541666088","43849,541666088"}, {"43849,5624993634","43849,5624993634"}, {"43849,5833326389","43849,5833326389"}, {"43849,6041659144","43849,6041659144"}, {"43849,6249991898","43849,6249991898"}, {"43849,6458324653","43849,6458324653"}, {"43849,6666657407","43849,6666657407"}, {"43849,6874990162","43849,6874990162"}, {"43849,7083322917","43849,7083322917"}, {"43849,7291655671","43849,7291655671"}, {"43849,7499988426","43849,7499988426"}, {"43849,7708321181","43849,7708321181"}, {"43849,7916653935","43849,7916653935"}, {"43849,812498669","43849,812498669"}, {"abc","abc"}, {"tets","tets"}, {"dfs","dfs"}, {"sdf","sdf"}, {"sdfs","sdfs"} } 
	),
	AddedIndex = Table.AddIndexColumn
	(
		Source,
		"Index",
		1,
		1
	),
	ChangeType = Table.TransformColumnTypes
	(
		AddedIndex,
		{{"TaskList SignOff Date and Time", Int64.Type}}
	),
	GroupAndTranspose = Table.Group
	(
		ChangeType,
		{"Index"},
		{{"AllRows", each Table.FromColumns( {List.Difference( Table.ColumnNames(_),{"Index"})}& Table.ToColumns( Table.Transpose(Table.RemoveColumns(_,"Index"),{"Value"})),{"ColumnName", "Value"}), type table [TaskList SignOff Date and Time=number, TaskList SignOff Date and Time2=text]}}
	),
	ExpandAllRows = Table.ExpandTableColumn
	(
		GroupAndTranspose,
		"AllRows",
		{"ColumnName", "Value"}
	),
	CheckError = Table.AddColumn
	(
		ExpandAllRows,
		"Benutzerdefiniert",
		each try [Value]
	),
	Expand = Table.ExpandRecordColumn
	(
		CheckError,
		"Benutzerdefiniert",
		{"HasError", "Value", "Error"},
		{"HasError", "Value.1", "Error"}
	),
	FilterForError = Table.SelectRows
	(
		Expand,
		each 
		(
			[HasError] = true
		)
	),
	ExpandError = Table.ExpandRecordColumn
	(
		FilterForError,
		"Error",
		{"Reason", "Message", "Detail"},
		{"Reason", "Message", "Detail"}
	)
 in 
	ExpandError

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Have fun

Jimmy